/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.antgroup.geaflow.dsl.udf.table.string;

import com.antgroup.geaflow.common.binary.BinaryString;
import com.antgroup.geaflow.dsl.common.function.Description;
import com.antgroup.geaflow.dsl.common.function.UDF;
import java.util.Objects;
import org.apache.commons.lang3.StringUtils;

@Description(name = "concat_ws", description = "Concat strings to one by the separator string.")
public class ConcatWS extends UDF {

    public String eval(String separator, String... args) {
        return StringUtils.join(args, separator);
    }

    public BinaryString eval(String separator, BinaryString... args) {
        BinaryString sep = Objects.isNull(separator) ? BinaryString.EMPTY_STRING :
                           BinaryString.fromString(separator);
        return BinaryString.concatWs(sep, args);
    }

    public BinaryString eval(BinaryString separator, BinaryString... args) {
        return BinaryString.concatWs(separator, args);
    }
}
